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Hi there. Here is a video from Matt Cutts https://www.youtube.com/watch?v=ePG5YYHU5Jo And he says "the more schema there is the better". And it does make sense. Schema is kinda like legend or hints on a map, which helps google to understand" what's what and where to go" So, the more help they have the better. However, do make sure that all markup is legitimate, makes sense and not used in spammy way. Cheers